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How to bring up the Kubernetes dual stack support?

Prerequisites

• You must be using Kubernetes 1.16 (alpha feature) or later (1.20 beta feature).
• Your cloud provider or underlying network must be able to provide Kubernetes nodes with routable IPv4 and IPv6 network interfaces.
• At least two nodes.IPv6 and IPv6 forwarding must be enabled:

  sysctl -w net.ipv6.conf.all.disable_ipv6=0
  sysctl -w net.ipv6.conf.all.forwarding=1

• All the nodes must have an IPv6 address and they should be able to reach others over an IPv6 connection.
• IPv6 forwarding must be enabled (sysctl -w net.ipv6.conf.all.forwarding=1)

Options to add:

• kube-controller-manager
  • –-feature-gates="IPv6DualStack=true"
  • –-cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>
  • –-service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>
• kubelet
  • –-feature-gates="IPv6DualStack=true"
• kube-proxy
• –-proxy-mode=ipvs
• –-cluster-cidrs=<IPv4 CIDR>,<IPv6 CIDR>
–-feature-gates="IPv6DualStack=true":
Edit netplan configuration file (/etc/netplan/50-vagrant.yaml). Add IPv6 address to list of addresses and set in interface section:

accept-ra: no

After that netplan apply needs to be called.

• Following parameters need to be added to kubeadm init command:

  --pod-network-cidr=10.233.64.0/18,2001:db8:1234:5678:8:2::/64 \
  --service-cidr=10.96.0.0/12,2001:db8:1234:5678:8:3::/108 \
  --feature-gates=IPv6DualStack=true \
  --apiserver-advertise-address=10.10.10.13